SOLUTION: If I have 140 questions, how many can I miss and still make a 70?

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Question 934479: If I have 140 questions, how many can I miss and still make a 70?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28140-X%29%2F140=70%2F100
%28140-X%29100=140%2A70
14000-100X=9800
-100X=-4200
X=42
You can miss 42 problems and get a 70.